- fixed AxisItem sometimes drawing the same tick twice (sometimes with different text)
- fixed handling of record arrays in setting ScatterPlotItem point data
- optional context menu for ImageItem
- inverted y-axis in Canvas (+y now points upward)
- extra __init__ arguments for Dock
- Transform can be constructed from Matrix4x4
- many others
Flowchart updates - added/fixed some display nodes
Merge from Kratz:
- documentation updates
- ComboBox class (updateList() allows entire item list to change while remembering previous setting)